Add switch CLI command to change accounts

[DaughterOfMars]

Description of change

This PR adds the Account::switch command to allow changing accounts.

Links to any relevant issues

Closes #487

Type of change

Choose a type of change, and delete any options that are not relevant.

• Enhancement (a non-breaking change which adds functionality)

How the change has been tested

Account "polpot": help
Command line interface wallet application based on the IOTA SDK

Usage: Account: <COMMAND>

Commands:
  addresses               List the account addresses
  balance                 Print the account balance
  burn-native-token       Burn an amount of native token
  burn-nft                Burn an NFT
  claim                   Claim outputs with storage deposit return, expiration or timelock unlock conditions
  claimable-outputs       Print details about claimable outputs - if there are any
  consolidate             Consolidate all basic outputs into one address
  create-alias-output     Create a new alias output
  create-native-token     Create a native token
  destroy-alias           Destroy an alias
  destroy-foundry         Destroy a foundry
  exit                    Exit the CLI wallet
  faucet                  Request funds from the faucet
  mint-native-token       Mint additional native tokens
  mint-nft                Mint an NFT. IOTA NFT Standard - TIP27: <https://github.com/iotaledger/tips/blob/main/tips/TIP-0027/tip-0027.md>
  melt-native-token       Melt an amount of native token
  new-address             Generate a new address
  node-info               Get information about currently set node
  output                  Display an output
  outputs                 List all outputs
  send                    Send an amount
  send-native-token       Send native tokens. This will create an output with an expiration and storage deposit return unlock condition
  send-nft                Send an NFT
  switch                  Switch to a different account
  sync                    Synchronize the account
  transaction             Show the details of a transaction [aliases: tx]
  transactions            List the account transactions [aliases: txs]
  unspent-outputs         List the account unspent outputs
  vote                    Cast votes for an event
  stop-participating      Stop participating to an event
  participation-overview  Get the participation overview of the account
  voting-power            Get the voting power of the account
  increase-voting-power   Increase the voting power of the account
  decrease-voting-power   Decrease the voting power of the account
  voting-output           Get the voting output of the account
  help                    Print this message or the help of the given subcommand(s)

Options:
  -h, --help     Print help
  -V, --version  Print version

Account "polpot": switch
error: the following required arguments were not provided:
  <OTHER_ACCOUNT>

Usage: Account: switch <OTHER_ACCOUNT>

For more information, try '--help'.

Account "polpot": switch --help
Switch to a different account

Usage: Account: switch <OTHER_ACCOUNT>

Arguments:
  <OTHER_ACCOUNT>  

Options:
  -h, --help     Print help
  -V, --version  Print version

Account "polpot": switch polpot
Account "polpot": switch hello
wallet error: account "hello" not found